Here is the eighth set of UD Citizen Monitoring Reports for 2015 covering the period of September 3rd to 24th. This will be our last report for the season, but we’ll continue to monitor at a reduced frequency in the off-season. Temperatures were within a normal range. Most of the area had 2 or more inches of rain between the 10thÂ and the 12th, but otherwise, conditions remain usually dry.
- Low Dissolved oxygen (< 4.0 ppm) levels remain widespread, although there have been recent signs of improvement at many sites that are not evident in the report which only lists DO levels below 5 ppm. Severely low readings (< 2.0 ppm) were intermittent in several dead-end canals and 2 upper tributaries (Old Mill and Dirickson creeks).
- Accumulations of Nuisance Aquatic Vegetation were minor with the exception of Diamond and Wagamons Ponds in Milton, although they appear to on the decline.
- Total Enterococcus bacteria levels were generally reduced, but remained elevated in 2 upper tributaries (Guinea and Dirickson creeks), and 2 dead-end canals (South Bethany).
- Harmful algae blooms of potentially toxic Blue Green algae remained widespread in the Broadkill watershed (Red Mill, Diamond and Wagamons ponds, and the Broadkill River tidal pond in Milton) but at generally reduced cell densities. This was the worst year I can remember in 10 years of monitoring the Broadkill. A photo of Microcystisseen from a dock is attached. In the estuaries, 2 dense blooms of a potentially toxic flagellate (Chloromorum) were seen at the Prime Hook NWR boat ramp and at Torquay canal. In the ocean and at the Indian River Inlet, background levels of Dinophysis and Karenia papilionacae continued to be seen.